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hammingCode.c
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hammingCode.c
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/*write a c program for generating and verifying hamming code for 7 bit, 12 bit and 15 bits of data.*/
#include<stdio.h>
int main(){
int n,i,a[20],p[20],p0,p1,p3,p7,t;
printf("Enter the number of bits: ");
scanf("%d",&n);
switch(n){
case 7: printf("Enter the data: ");
for(i=0;i<n;i++){
if(i==0||i==1||i==3)
continue;
scanf("%d",&a[i]);
}
a[0]=a[2]^a[4]^a[6];
a[1]=a[2]^a[5]^a[6];
a[3]=a[4]^a[5]^a[6];
printf("Hamming code generated is :");
for(i=0;i<n;i++)
printf("%d",a[i]);
p0=a[0]^a[2]^a[4]^a[6];
p1=a[1]^a[2]^a[5]^a[6];
p3=a[3]^a[4]^a[5]^a[6];
if((p0==0)&&(p1==0)&&(p3==0))
printf("\nNo error detected\n");
else{
t=(p3*4)+(p1*2)+(p0*1);
printf("Error detected at position :%d\n",t);
}
if(a[t-1]==0)
a[t-1]=1;
else
a[t-1]=0;
for(i=0;i<7;i++)
printf("%d",a[i]);
break;
case 12: printf("Enter the data: ");
for(i=0;i<n;i++){
if(i==0||i==1||i==3||i==7)
continue;
scanf("%d",&a[i]);
}
a[0]=a[2]^a[4]^a[6]^a[8]^a[10];
a[1]=a[2]^a[5]^a[6]^a[9]^a[10];
a[3]=a[4]^a[5]^a[6]^a[11];
a[7]=a[8]^a[9]^a[10]^a[11];
printf("Hamming code generated is :");
for(i=0;i<n;i++)
printf("%d",a[i]);
printf("\nError identification\n");
p0=a[0]^a[2]^a[4]^a[6]^a[8]^a[10];
p1=a[1]^a[2]^a[5]^a[6]^a[9]^a[10];
p3=a[3]^a[4]^a[5]^a[6]^a[11];
p7=a[8]^a[9]^a[10]^a[11];
if((p0==0)&&(p1==0)&&(p3==0)&&(p7==0))
printf("\nNo error detected\n");
else{
t=(p7*8)+(p3*4)+(p1*2)+(p0*1);
printf("Error detected at position :%d\n",t);
}
if(a[t-1]==0)
a[t-1]=1;
else
a[t-1]=0;
for(i=0;i<12;i++)
printf("%d",a[i]);
break;
case 15: printf("Enter the data: ");
for(i=0;i<n;i++){
if(i==0||i==1||i==3||i==7)
continue;
scanf("%d",&a[i]);
}
a[0]=a[2]^a[4]^a[6]^a[8]^a[10]^a[12]^a[14];
a[1]=a[2]^a[5]^a[6]^a[9]^a[10]^a[13]^a[14];
a[3]=a[4]^a[5]^a[6]^a[11]^a[12]^a[13]^a[14];
a[7]=a[8]^a[9]^a[10]^a[11]^a[12]^a[13]^a[14];
printf("Hamming code generated is :");
for(i=0;i<n;i++)
printf("%d",a[i]);
printf("\nError identification\n");
p0=a[0]^a[2]^a[4]^a[6]^a[8]^a[10]^a[12]^a[14];
p1=a[1]^a[2]^a[5]^a[6]^a[9]^a[10]^a[13]^a[14];
p3=a[3]^a[4]^a[5]^a[6]^a[11]^a[12]^a[13]^a[14];
p7=a[8]^a[9]^a[10]^a[11]^a[12]^a[13]^a[14];
if((p0==0)&&(p1==0)&&(p3==0)&&(p7==0))
printf("\nNo error detected\n");
else{
t=(p7*8)+(p3*4)+(p1*2)+(p0*1);
printf("\nError detected at position :%d\n",t);
}
if(a[t-1]==0)
a[t-1]=1;
else
a[t-1]=0;
for(i=0;i<15;i++)
printf("%d",a[i]);
break;
default:printf("invalid size.\n");
}
return 0;
}